量子阱中强耦合极化子自陷能的温度依赖性  

TEMPERATURE DEPENDENCE OF THE SELF-TRAPPING ENERGY OF STRONG-COUPLING POLARON IN A QUANTUM WELL

作　　者：额尔敦朝鲁[1] 

机构地区：[1]河北科技师范学院数理系,河北秦皇岛066044

出　　处：《红外与毫米波学报》2005年第2期89-92,共4页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金(10174076);内蒙古自然科学基金(200208020110)资助项目

摘　　要：采用Huybrechts的线性组合算符法和改进的LLP变分法,研究了晶格热振动对无限势垒量子阱中电子与界面光学声子强耦合、与体纵光学声子弱耦合极化子性质的影响. 推导出作为阱宽和温度函数的极化子自陷能的表达式. 对KI/AgCl/KI量子阱进行了数值计算,结果表明,极化子的自陷能随阱宽增加而减小、随温度升高而减小,但不同支声子与电子相互作用对极化子自陷能的贡献以及它们随阱宽和温度的变化情况大不相同.The effects of lattice vibration on the properties of the polaron, which was weakly coupled with bulk longitudinal optical phonons and strongly coupled interface optical phonons, in an infinite quantum well were studied by means of the Huybrechts' linear-combination operator and a modified LLP variational method. The expressions for the self-trapping energy of the polaron in a quantum well as a function of the well's width and temperature were derived. Numerical results of the polaron self-trapping energy for KI/AgCl/KI QW show that the self-trapping energy of the polaron will decrease with increasing the well's width and temperature, but the contribution of interaction between the electron and the different branch of phonons to the self-trapping energy and their changing with the well's width and temperature are different.

关 键 词：极化子 自陷能 量子阱 强耦合 温度依赖性 线性组合算符法 界面光学声子 电子相互作用 晶格热振动 纵光学声子 数值计算 AGCL 温度函数 温度升高 变化情况 变分法 LLP 表达式 阱宽 弱耦合 减小 势垒 

分 类 号：O471.3[理学—半导体物理] O471.4[理学—物理]